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3 years ago

10

Two children are waiting to go down a slide the first child goes down and then stays sitting at the bottom of the slide if there

is no friction involved and all of the mechanical energy is conserved what would happen to the energy of the second child form the top of the slide

1 answer:

Anon25 [30]3 years ago

5 0

its b got it right on quiz

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The radioactive decay of a certain sample produced 846 disintegrations per minute. exactly 3.00 days later, the rate of decay wa

Margarita [4]

Answer:

$\boxed{\text{1.81 da}}$

Explanation:

1. Calculate the decay constant

The integrated rate law for radioactive decay is 1

$\ln\dfrac{A_{0}}{A_{t}} = kt$

where

A₀ and A_t are the counts at t = 0 and t

k is the radioactive decay constant

$\ln \dfrac{846}{269} = k \times 3.00\\\\\ln3.145 = 3.00k\\1.146 = 3.00k\\\\k =\dfrac{1.146}{3}\\\\k = \text{0.382 /da}\\$

2. Calculate the half-life

$t_{\frac{1}{2}} = \dfrac{\ln2}{k} = \dfrac{\ln2}{0.382} = \text{1.81 da}$

The half-life for decay is $\boxed{\textbf{1.81 da}}$ .

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4 years ago

During an experiment a thermometer was placed in a beaker containing hydrogen peroxide. The following observations were recorded

Rudiy27

Answer:

Chemical

Explanation:

The change was chemical, because it can no longer be returned to the original form. You cannot get back the bubbles or fizz from the air.

3 0

3 years ago

Read 2 more answers

The atomic number of lead is 82. Its mass number is 207?.how many protons neutrons and electros does the atom of lead contain

kupik [55]

Lead have:

82 electrons

82 protons

125 neutrons

Explanation:

The number of electrons and protons are given by the atomic number of the element.

Lead have 82 electrons and 82 protons.

The number of neutrons are given by the difference between the mass number and atomic number.

For lead number of neutrons = 207 - 82 = 125.

Learn more about:

particles in the atom

brainly.com/question/439508

#learnwithBrainly

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3 years ago

What is the difference between a quantity and a unit?

Irina-Kira [14]

$Question$

What is the difference between a quantity and a unit?

Answer:

Physical quantities are a characteristic or property of an object that can be measured or calculated from other measurements. Units are standards for expressing and comparing the measurement of physical quantities. All units can be expressed as combinations of four fundamental units.

Hope this helps!!!

$xXxAnimexXx$

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3 years ago

Which nonmetals in the atmosphere and their combinations are essential for life on earth

geniusboy [140]

Nitrogen, oxegyn, and water are nonmetals in the atmosphere and combinations are essential for life on earth

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3 years ago